Doorbell



FIG. 1 is a front perspective view of a doorbell showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a top view thereof;

FIG. 5 is a bottom view thereof;

FIG. 6 is a left side view thereof;

FIG. 7 is a right side view thereof;

FIG. 8 is a cross-sectional view taken along line 8-8 of FIG. 2; and,

FIG. 9 is an enlarged view of the encircled portion 9 indicated in FIG.8.

The broken lines depict portions of the doorbell that form no part ofthe claimed design.

CLAIM The ornamental design for a doorbell, as shown and described.